Réponse :
1.The tense used in the if clause is the simple present.
2.the simple future is used in the main clause.
3.You only say the ''hav''.
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b.I would have come to meet you if you sent me a message with your phone.
c.if you hadn't gone by taxi, you wouldn't have arrived on time.
d.if you left earlier, you wouldn't be late.
